Electromagnetic switch



July 6 1926.

A. A. KENT ELECTROMAGNETIC SWITCH Filed July 13, 1921 2 AShoots-Shut 2 INVENTO/R.

Patented July 6, 1926.

UNITED STATES PATENT. OFFICE.

LECTROMAGNETIC SWITCH.

l Application lcd July 13, 1921.l Serial No. 484,319.

My invention relates to electro-magnetic of the yoke 9 and the extension 5 sli vhtly switching means, as a cut-out, intervening between a generator and a storage battery, as employed, for example, upon 'automobiles or other motor vehicles. l

My invention resides in features of construction and combination, hereinafter described, yielding simplicity, cheapness, and

` satisfactory operation.

For an illustration of one of the various forms my inventionmay take, reference is to be had to the accompanying drawings, in which Fig. 1 is a vertical sectional view, in. elevation, of my cut-out and associated parts.

Fig. 2 is a top plan view of the cut-out.

Fig. 3 is an end elevational view of the cut-out.

Fig. 4 is an elevational view from the opposite end of the cut-out, on larger scale, and partly in section.

Figs. 5 and 6 are perspective views of elements of the cut-out.

Fig. 7 is a diagrammatic view indicating one of the modes of use of the cut-out.

Referring to the drawin F is a portion of the cylindrical field yo e of a dynamoelectric generator upon which the cut-out is mounted within the cover or casing K conforming to the cylindrical surface of the yoke F and secured thereto, as by screws 1, 1. The cut-out comprises the cast iron base 2, in a cylindrical hole in which is snugly fitted the core C of soft iron, or equivalent, as mild steel, etc. Surrounding thecore C are the fine wire or shunt coil or winding P and the series or coarse wire winding S. The coil P may be first wound upon the insulating spool 3 and the series winding S wound upon the shunt winding P, the unit thus formed being then placed upon the core C, which latter is then inserted in the base 2.

The core C ma be provided with a circular or other suitably shaped head 4 presented to the sheet iron o r steel armature A having the heel or extension 5 projecting at right angles and secured by rivets 6 to the leaf s ring 7 secured by screws or other suitab e fastening means 8 to the cast iron yoke 9 integral with the base 2 and forming therewith and with the core C and armature A the magnetic circuit of the cut-out. The extension 5 is disposed in a notch 10 at the upper end of the yoke 9, the armature A being slightly spaced from the upper end arts spaced from the side of the notch 10, w ereby a short air gap of relatively great area, and therefore suitabl small reluctance, is formed. Overlying t e armature A is the contact spring 11 having a hole into' which extends the projection 12 shown as of the meta-l of the armature A displaced laterally or extruded therefrom, and serving with the rivet 13 to prevent the sprin 11 from moving laterally with respect to t e armature A. The rivet 13l extends through the washer 14, the spring 11 and the armature A, and holds the spring 11 securely to the armature. The spring 11 projects to the left beyond the end of the armature A, Fi s. 1 andl 2, and oarries adjacent its end t e tungsten or other suitable contact 15 adapted, upon attraction of thef armature A downwardly by the magnet, to engage and make electrical contact with the stationary contact 16, of tungsten or other suitable material, secured to and in electrical communication with the plate 17 extending transversely and having at its ends the holes 18, Fig. 6, registering with the upper ends of the columns 19, 19, upstand ing from and integral with the base 2.

The back sto bridge or plate 20, Fig. 5, has at its ends t e holes 21, 21, also registering with the upper ends of the columns 19,

the plate 20 being disposed above the armature A and sprin 11 to limit their upward movement upon eenergization of the magnet. The plate 17 is disposed upon the washers 22, 22, Fig. 4, of insulating material., Andupon the upper surface of the plate 17 are disposed washers 23, 23, of insulating material, and upon these rest the ends of the back stop plate 20, u on which in turn are disposed the metal loc washers 24, 24. The holes 18, 21 and the holes in the washers 22, 23 and 24 are aligned, and through them pass the screws 25, 25 threaded into the columns 19, suitable bushings 26, 26 of insulating material bein disposed in the holes 18 of the plate 17, w ereby the plate 17 is comletely insulated from the pillars 19, 19.

he plate 17 is in addition 1nsulated from the back stop 20, which latter ma be bent downwardly at its center, as in icated in Figs. 4 and 5. IOne terminal, as 27, of the 27 being formed by expanding or 'torcing the metal of the tongue into arcuate portions 29. The wire 27 is entered into the assa e so formed, which communicates with t e opening 30 formed by punching a piece from the tongue 28. The wire 27 when so e'ntered'is preferably soldered in place.

The other end of the series winding S has connected thereto one terminal of the shunt winding P, and extends through an'insulating bushing 31 in the field yoke F to the intermi-.thereof and connects with 'one terminal ot the generator. rlhe other terminal ot .the shunt winding P connects with the binding post or stud 32, with which connects also the other terminal of the generator by wire 33 extending through the bushing 31. 'lhe stud 32 is suitably insulated from the.. coverl, as bythe member 34: of molded insulating material or the like, and terminates in the external binding post 35. Y

llhe contactl is grounded through the springv l1 and armature A to the yoke 9, which in turn is grounded upon the field yoke P ot the generator, since the base 2. 1s secured to the'yoke F b screws threaded mto the yoke F land passing through the lugs e 2a upon the base 2.' The yoke P is in electrical communication with the ground or re- ,y

turn conductor ot the generator-battery system, as is common upon autqmobiles.

Secured by the rivets 6 to the armature projection 5 1s an additional spring 36, which stands 0H from the spring 7 and whose lower end engages beneath the -head of the screw 3'? threaded into the yoke 9 for giving to the spring 36 and the armature control as a whole a suitable adjustment and tension.

As illustrative ot one oi the modes of use et the cut-out structure described, reference may be had to lllig. 7, wherein the generator armature is indicated at G and the shunt Vheld at itl, the latter being excited Jfrom the third brush 71 one of the main brushes ot the generator, as g', connecting with the service lead z", while the other generator brush 7 connects to the common terminal of the cutout windings P and S.' 7lhe other terminal ot the shunt winding P connects to the conductor t, while the lother terminal of the series winding S connects to the contact 16 and to the ground or return conductor E when the vcut-out magnet is energized and the armature A attracted by the core C. The storage battery B is connected between the conductor and the ground or return conductor E, as are also the lamps L and the i primary l of an ignition induction coil'whose high tension secondar is a, the primary circuit being controlled y the interrupter con-- tacts e controlled by the usual timer cam d.l

As usual, when the generatorGr is started,

Athe shunt winding P alone is excited, Aand when suciently excited, when the generator G develops suciently high potential, causes nannies' is owing from the generator to the battery.

lt'current should flow in opposite direction, as from battery B to the generatonG through the series'winding S, the latter will oppose the shunt winding P, and the attraction upon the armature A is so greatly diminished that it recedes from the core C, separating the contacts'l and 16 .and so cutting out the battery from communication with the generator G. Y

When the armature A is attracted, the contact 15 engages contact 16, and u'pon` continued further attraction of the armature A the latter separates somewhat from the spring l1, which latter accordingly'. causes the contact 15 to slide upon the contact 1G, as lrom right toward the left, Fig-1, giving a wiping action which keeps the contacts olea-n.

"What l claim is .yieldingly holding the armature in a predetermined position relatively to said core.

-2. ln a cut-out, the combination with a core, ot a yoke member extending substantially parallel therewith, a sheet metal armature extending transversely of said core and having a transverse projection extending substantially parallel with said yoke member-and spaced therefrom, a metal leir'f secured tlatwise to said projection and to said yoke member and extending across the space between them, and a leaf spring attached to said projection and extending along -said yoke member and spaced therefrom, and adjusting means engaging the free end of said leaf spring.

'3. lin a cut-out, thev combination with a core, of an armature co-acting therewith, a leaf spring overlying said armature, a contact carried by said leaf spring, a co-acting stationary contact, a single rivet attaching said leaf spring securely to said armature at a point remote from said first named contact, said leaf spring having an aperture, and means on said armature extending into said aperture for preventing movement oi said leaf spring about said rivet.

4f. In a cut-out', the combination with a core, of a sheet metal armature, a leat` spring 1. lin a cut-out, the combination'` with a l l ing on said core, an armature carried by with said sald base member and co-acting said core, a stationary contact carried by v base member, a co-acting contact carried by said armature, a cup-shaped casing secured to said field frame and enclosing the cut-out structure, and terminal structure carried by 10 said casing and included 1n the circuit of said winding.

In testimony whereof I have hereunto affixed my signature this 30th day 'of June,

` ARTHUR ATWATER KENT.

contact, a rivet securing said spring to said armature, said spring having an aperture, and an extruded portion ot said armature extending into said aperture, said rivet be ing'positioned nearer said contacts than said aperture.

5. ln a cut-out, an iron base and an upstanding yoke member integral therewith, a

core connected with said base and extending substantially parallel to said yoke member,

an armature supported on said yoke member and extending across said core, relatively spaced columns on said base adjacent Vthe tree end of said armature, a plate secured to and' bridging said columns and insulated.

theretrom, a stationary contact on saidplate, and a -2o-acting movable contact carried by said armature.

6. ln a cut-out, an iron base and an upstandingv yoke member integral therewith, a core connected with said base andv extending substantially parallel to said yoke member, an armature supported on said yoke member and extending across said core, relatively spaced columns on said base adjacent the -l'ree end ot said armature, a plate secured to and bridging said calumns and insulated therefrom, a stationary contact on v said plate, a leal spring overlying said armature and secured thereto, and a contact carried by said leal spring and co-acting with said lirst named contact.

7. ln a cut-out, an iron base and an upstanding yoke member integral therewith, a core connected with said base and extending substantially parallel to said yoke member,

' an armature supported on said yoke mem:-

an armature supported on saidyoke mem.

ber and extending across said core columns on the base adjacent the tree end ot the armature, a contact plate carried by said columns, a back stop plate carried by said columns, and means common to said plates securing them to said columns 9. ln a cut-out, an iro-n base and an upstanding yoke member integral therewith, a core connected with said base and extending substantially parallel to said yoke member, an armature supported on said yoke member and extending across said core columns on the base adjacent the tree end ot the arma ture, a contact plate carried by said columns,

Aa back stop plate carried byfsaid columns, means common to said plates securing them to said columns, and means insulating said plates from each other.

l0. vlln aout-out, a base, a core upstanding therefrom, a shunt winding surrounding said core, a series winding surrounding said shunt winding, an armature extending across said core, a contact carried by said armature, supporting means on said base eX- tending parallel with said core and outside the etlective magnetic circuit ot the electromagnet, a plate secured on said supporting means, a co-acting contact carried on said supporting means, a downwardly extending tongue on said plate connected to one ter minal ot said series winding, and a back stop carried by said supporting means.,

ll. ln a cut-out, a base, a core upstanding therefrom, an armature extending transversely oit said core, a lealZ spring overlying said armature and extending beyond the tree end thereof, a contact carried by said spring, relatively spaced columns upstand ing trom said base, a plate secured to and brldging and insulated trom said columns, a co-acting contact thereon, and a back stop plate extending above said spring and secured to said columns.

l2. ln a cut-out, a core, a yoke member disposed substantially parallel thereto, an armature extending across the ends ot said core and yoke member and having a heel en tending along said yoke member, and a denible sheet metal member secured to said heel and yoke tor yieldingly supporting said armature.

t8. ln a cut-out, a core, a yoke member disposed substantially parallel thereto, an

armature extending across the ends ot said core and yoke member and having a heel eirtending along said yoke member, said yoke member having a notch in which said heel is disposed, and a flexible sheet metal member secured datwise to said heel and yoke member for yieldingly supporting said armature.

ll. lln a cutout, the combination with a magnetizable base member, oit a core thereon, a yoke member upstanding from-and integral with said-base member, an armature supported in magnetic relation with and upon said yoke member and coacting with said core at its end opposite said base member, a supporting member upstanding from and integral with said lbase member, said yoke and supporting member being disposed on opposite sides ot said core, the tree end ot said armature being so spaced from said supporting member as to be substantially uninfluenced magnetically thereby, a contact carried by said supporting member, and a co-acting contact carried by said armature.,

l5. Cut-out structure comprising the combination with a magnetizable base member,

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